In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

SA minister asks about guards in care home

Security guards may be placed at a troubled South Australian government-run nursing home as Mental Health Minister Leesa Vlahos reacts to calls from the opposition.

Ms Vlahos revealed on Wednesday there had been a fresh allegation of abuse this week at the home in Oakden, which was already set to close after a damning report on its quality of care.

She says she will speak with the site's clinical leader about whether it would be appropriate to have security guards at the home, while another facility is being prepared for the patients.

"I'm not ruling it out, but I need to take some advice from the clinical leads there today," she told ABC radio on Thursday.

"I need to place the care and concerns of the people, the residents of Oakden, at the heart of everything we do in responding to this."

Opposition health spokesman Stephen Wade said putting security guards into the facility around the clock was the "decisive action" needed to reassure the families of residents that their loved ones were safe.

"They need to know that when they aren't able to be at Oakden, the security team will be their eyes and ears," he said in a statement on Thursday.